Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Marine diesel engine, engine control device and method

A diesel engine and control device technology, applied in engine control, engine components, machines/engines, etc., can solve problems such as cost increase and achieve stable denitrification treatment

Active Publication Date: 2021-12-07
MITSUBISHI HEAVY IND LTD +1
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there may be an increase in cost

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Marine diesel engine, engine control device and method
  • Marine diesel engine, engine control device and method
  • Marine diesel engine, engine control device and method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0037] figure 1 It is a schematic configuration diagram showing the marine diesel engine of the first embodiment.

[0038] In the first embodiment, if figure 1 As shown, a marine diesel engine 10 includes an engine main body 11 , a supercharger 12 , an SCR denitrification device 13 , an exhaust gas temperature raising device 14 , and a control device 15 .

[0039]The engine main body 11 is a propulsion engine (main engine) that rotationally drives a propulsion propeller via a propeller shaft. The engine main body 11 is a single-flow scavenging type diesel engine, which is a two-stroke diesel engine, and the intake and exhaust flow in the cylinder is set to a single direction from the bottom to the top, thereby eliminating residual exhaust gas. The engine main body 11 includes: a plurality of cylinders (combustion chambers) 21 through which pistons move up and down; a scavenging manifold 22 communicating with each cylinder 21 ; and an exhaust manifold (exhaust static pressure...

no. 2 approach

[0072] image 3 It is a timing chart showing the operation of the SCR denitration device in the marine diesel engine of the second embodiment. In addition, the basic structure of the marine diesel engine of this embodiment is substantially the same as that of the above-mentioned first embodiment. figure 1 In the following description, components having the same functions as those in the first embodiment described above are denoted by the same reference numerals and detailed description thereof will be omitted.

[0073] Such as figure 1 As shown, in the marine diesel engine of the second embodiment, the control device 15 stops the operation of the exhaust gas temperature raising device 14 ( 14A) when the current engine speed reaches the critical speed range A.

[0074] Such as figure 1 as well as image 3 As shown, when the sailing sea area of ​​the ship is in the ECA (restricted sea area) (ON), the SCR denitrification device 13 works (ON) and the exhaust gas temperature ra...

no. 3 approach

[0079] Figure 4 It is a timing chart showing the operation of the SCR denitration device in the marine diesel engine of the third embodiment. In addition, the basic structure of the marine diesel engine of this embodiment is substantially the same as that of the above-mentioned first embodiment. figure 1 In the following description, components having the same functions as those in the first embodiment described above are denoted by the same reference numerals and detailed description thereof will be omitted.

[0080] Such as figure 1 As shown, in the marine diesel engine of the third embodiment, the control device 15 sets the lower limit of the critical speed range A obtained by adding a preset margin value B to the lower limit value of the critical speed range A. The lower limit value of the critical speed range A is low, and when the current engine speed reaches the lower limit value of the margin, the exhaust gas temperature raising device 14 ( 14A) is stopped.

[0081...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

In a marine diesel engine, it is equipped with: an engine main body (11); an SCR denitrification device (13), which is arranged on an exhaust line (G4) of exhaust gas discharged from the engine main body (11); an exhaust gas temperature raising device ( 14), the exhaust gas temperature raising device heats up the exhaust gas flowing into the SCR denitrification device (13); and the control device (15), the control device controls the work of the exhaust gas temperature raising device (14), and when the engine speed is at The exhaust gas temperature raising device (14) is stopped working in the preset critical speed area (A).

Description

technical field [0001] The present invention relates to a marine diesel engine equipped with a selective catalytic reduction (SCR: Selective Catalytic Reduction) denitrification device. Background technique [0002] A marine diesel engine, which is a main engine mounted on a ship, includes nitrogen oxides (NOx) in exhaust gas, and therefore is equipped with a device for reducing the NOx. As a device for reducing this NOx, there is an SCR denitrification device. The SCR denitrification device supplies a reducing agent capable of reducing nitrogen oxides into the exhaust pipe, and promotes the reaction between the nitrogen oxides in the exhaust gas and the reducing agent, thereby removing and reducing the nitrogen oxides in the exhaust gas. However, in order for the SCR denitrification device to efficiently remove nitrogen oxides in the exhaust gas through the catalyst, it is necessary to maintain the temperature of the exhaust gas at a predetermined reaction temperature or h...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): F02D45/00B01D53/94F01N3/08F02D41/04
CPCB01D53/94F01N3/08F02D41/04F02D45/00B01D53/9418F01N3/2066F01N2590/02F01N2900/1404F02D41/1446F02D2200/101
Inventor 中川贵裕平冈直大
Owner MITSUBISHI HEAVY IND LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com